AirHint found the following cheapest return flights from Montreal (YUL) to Buenos Aires (EZE) in December 2025 (see full year).

Return flights

02 Dec - 09 Dec	United
05 Dec - 12 Dec	Air Canada
06 Dec - 13 Dec	Air Canada
07 Dec - 14 Dec	Air Canada
03 Dec - 10 Dec	Copa
02 Dec - 16 Dec	Delta
04 Dec - 11 Dec	LATAM Airlines Group
08 Dec - 15 Dec	LATAM Airlines Group
09 Dec - 16 Dec	LATAM Airlines Group
10 Dec - 17 Dec	LATAM Airlines Group
16 Dec - 06 Jan	Air Canada
31 Dec - 08 Jan	Arajet
27 Dec - 12 Jan	Air Canada
13 Dec - 01 Jan	Air Canada
31 Dec - 07 Jan	Arajet
25 Dec - 07 Jan	Air Canada
17 Dec - 11 Jan	Arajet
29 Dec - 05 Jan	Air Canada
28 Dec - 04 Jan	Air Canada
27 Dec - 03 Jan	Air Canada

Also check the deals for one-way flights from Montreal to Buenos Aires in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Montreal to Buenos Aires in December from $776

Return flights